fix(typing): update misc payload types

[shiftinv]

Summary

Updates some typings in disnake.types to match the API docs, which weren't worth a PR on their own.
Almost no runtime changes, except for some new defaults/fallbacks in sticker parsing.

Checklist

• If code changes were made, then they have been tested
  • I have updated the documentation to reflect the changes
  • I have formatted the code properly by running pdm lint
  • I have type-checked the code by running pdm pyright
• This PR fixes an issue
• This PR adds something new (e.g. new method or parameters)
• This PR is a breaking change (e.g. methods or parameters removed/renamed)
• This PR is not a code change (e.g. documentation, README, ...)